Since everybody on this comm seem to be circlejerking, let me how to tell you how to get rid of this POS. Shit’s called BGAupsell and resides in Windows\Temp\MUBSTemp, set yourself as owner of the file via your admin account and then delete it and replace it with an an empty EXE file that you assign ownership to yourself with. Then you write protect it and you’re done. If you just delete the dir or the file, it’ll come back next major update.
NOW, to really give MS a punch in the dick, you’re also going to want to disable the search menu ad as well: